Shawn Johnson Is Having Trouble Losing Weight on DWTS

Shawn Johnson is seeing positive results in the ballroom this season on the 15th season of Dancing with the StarsAll-Stars, but the numbers she sees on the scale after the show's grueling workouts aren't quite as impressive – yet.

"[Other contestants] are like, 'I've lost 10 pounds,' and I'm like, 'Cool, good for you,' " the former Olympic gymnast, 20, told PEOPLE with a laugh backstage after Monday night's show. "I think over time, my body will change. It's just different."

Continues the star, "Especially coming from Olympic training, I'm used to seven hours a day of the hardest workouts, so it takes more. It's not like the others who are like, 'Oh, I lost 13 pounds in two days.' "

"I feel like an old man next to her sometimes," he said, jokingly. "She's like the energizer bunny. She's like, 'Let's go again.' I said, 'Listen, I don't run 10 miles before I rehearse.' She's like, 'I've been up since 5:30 a.m.' "

As for her meal plan, the athlete steers clear from junk.

"I do the same thing I've always done through training," she explains. "If I go and see an entire buffet, I'll go straight for the protein and that's about it. I feel like everything else is a waste when you're just in a hurry. Chicken and vegetables, that's about it."